Meanwhile senior frontbenchers acknowledged concerns about the rise of Nigel Farage's Ukip, which made inroads into some of the Labour Party's traditional support at last month's elections.
The Mail on Sunday reported that she told the event at Queen Mary University of London: "Our very raison d'etre will be threatened if the working people, who the Labour Party have got to be there for, and got to be a voice for, start to drift away because they don't see us as the answer."
Former Cabinet minister Peter Hain said Mr Miliband was "likely" to be in No 10 after the 2015 election, but it was "very hard" for the party to win a majority.
She told BBC1's Andrew Marr Show: "We can't imitate Ukip, we have got to take them on."
On BBC Radio 5 Live's Pienaar's Politics, she added: "I think that what Ed's done since the election has been immensely important, both in terms of uniting the Labour Party, in setting out the policies that helped us win 300 more councillors in the local elections, whether that's from the energy price freeze to building more homes and so on.
"We are all working together, we are working with Ed in order to keep campaigning."
We're in a multi party system."
Concerns about the loss of Labour's core support to Ukip were raised by shadow work and pensions secretary Rachel Reeves on the day of Prada Cahier Notebook Leather Shoulder Bag the Newark by election, according to reports.
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the right person even if maybe they don't see that at the moment."
The Neath MP said: "Whether we'll have a majority, which I will fight for along with every other Labour Party member, I don't know because it's very, very hard to win a majority now in British politics because we're not in a two party system, which we had for generations. Prada Handbags Uk
He added: "I think that Ed Miliband is well placed to lead the government in the future and I think people, when they see him as prime minister, will actually realise that they've elected Prada Cahier Leather Shoulder Bag
Majority win 'hard' From St Helens Star
tax separate from existing business rates, firms in prosperous areas of England would face a new business tax to fund handouts in poorer areas and farmers would lose a tax break, the newspaper said.
Labour distanced itself from a leaked document on the future of high streets commissioned by the party, which the Mail on Sunday reported was recommending a range of new taxes to fund regeneration.
Asked if he thought Ms Reeves was right, he told BBC1's Sunday Politics: " If we have got more work to do to get people to the polling booths, then absolutely.
Voters "don't see" Ed Miliband as a prime minister and Labour will struggle to achieve an outright victory in next year's general election, one of the party's senior MPs has conceded.
Mr Hain, who is standing down at the next election, told Sky News that voters would realise that Mr Miliband was the right person to lead the country once he was in Downing Street "even if maybe they don't see that at the moment".
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